Granted Patent
Utility
US 5,332,789 · App. 07/974,591
Polypropylene block copolymer resin and compositions
Inventors:
Akira Tanaka, Masaru Nakagawa, Hideo Kusuyama, Sueto Miyazaki, Tatsuya Housaki
Patented Case
View Patent ↗
Granted: Jul 26, 1994
Filed: Feb 26, 1993
Inventors
Akira Tanaka
Masaru Nakagawa
Hideo Kusuyama
Sueto Miyazaki
Tatsuya Housaki
Assignee (at issue)
Idemitsu Petrochemical Co., Ltd.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.